Copied from - https://forums.eveonline.com/t/manually-copy-settings-between-characters-and-accounts/32704
Nalia Violet Oct '17 Hi all,
here’s the new guide for copy settings between characters. It works under Windows 7, 8.1 and 10. Personally tested under Windows 10 and 7.
The Overview can be saved and exported/imported directly in game. But not the windows settings, arrangement, UI, buttons, etc. Or at least I don’t know how to, past this procedure.
Navigate to “C:\Users%USERNAME%\AppData\Local\CCP\EVE”
Here you have 2 folders named “xyzabcd_tranquility”. You need to locate the exact folder. Just enter in both folders and then in one of the “settings” folder. You must have files named “core_char_xyzabcd” (for the character) and “core_user_xyzabcd” (for the account) where xyzabcd is a number. In my case the folder is “f_eve_sharedcache_tq_tranquility\settings_f_eve_online_tranquility”. If you can’t locate the exact folder, follow step 3 and then retry.
Open the Eve Launcher, start the game with the account and the character from which you want to copy the settings. Then logoff and close the Launcher. With this, it will be easier to locate the files with the “Last Modified” date attribute. There are 2 DAT files, one named “core_char_xyzabcd.dat” (for the character) and one named “core_user_xyzabcd.dat” (for the account). If you jumped the step 2, now you can locate the folder easily.
DO A BACKUP. Backup all folder, backup all files, do what you want. But do a backup.
After the backup, redo the step 3, but this time with the other account and/or character you want to copy the settings. Now you can locate easily again
Do a backup of these files too, if you hadn’t already done.
Now you have simply to rename the DAT files. For example: 7.1) my account is the file “core_user_880832.dat”, the character is the file “core_char_93198572.dat”. I want to copy those settings to other accounts and characters 7.2) the other account is “core_user_2434402.dat” and character "core_char_332195920.dat" 7.3) I make a copy of the files of step 7.1, then delete the files of step 7.2 and rename the copies (from “core_user_880832 - Copy.dat” to “core_user_2434402.dat” and from “core_char_93198572 - Copy.dat” to “core_char_332195920.dat”)
Try to login and play. Now you have the settings copied.
Remember:
do always a backup of everything the file “core_user” is the file related to the account the file “core_char” is the file related to the character if you have only 1 account, you have only 1 “core_user” file. Just copy/rename only the “core_char” file Thanks to the users that wrote the old procedure: https://forums-archive.eveonline.com/default.aspx?g=posts&m=2588207 33
(copy pasted from my old post: https://forums-archive.eveonline.com/topic/498597/ 9)
========================================================================================================================= UPDATE!
Running the game in Steam using Proton I found the character files here - /home/nailed/.steam/steam/steamapps/compatdata/8500/pfx/drive_c/users/steamuser/Local Settings/Application Data/CCP/EVE/z_home_nailed_.steam_steam_steamapps_common_eve_online_sharedcache_tq_tranquility/settings_Default